Forcing uppercase only into QLineEdit

crystal_ice

How can i set a line edit (named textbox1) to uppercase only?

I tried InputMethodHints:

@
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->textbox1->setMaxLength(50);
ui->textbox1->setInputMethodHints(Qt::ImhUppercaseOnly);
}
@

I tried it via the Design Mode as well, going to properties, expanding the InputMethodHints list and selecting ImhUppercaseonly checkbox.

I also tried this:
@
void MainWindow::on_textbox1_textChanged(const QString &arg1)
{
QFont.setCapitalization(QFont::AllUppercase);
}
@

and this:
@
QValidator::State pqUpcaseValidator::validate(QString& Text, int& Pos) const
{
Text=Text.Upper();
return Acceptable;
}
@

Any help would be appreciated. Thank you.

dheerendra

Try this.

@ QRegExp reg("[A-Z]{1,20}");
QRegExpValidator val(reg,0);
edit.setValidator(&val);@

Helps you enter only 20 characters. It will only accept the capital letters.

crystal_ice

One error message says 'edit' wasn't declared in the scope.

@
void MainWindow::on_textbox1_textEdited(const QString &arg1)
{
QRegExp reg("[A-Z]{1,50}");
QRegExpValidator val(reg,0);
edit.setValidator(&val);
}
@

dheerendra

edit is object of QLineEdit. Please pass object of QLineEdit you have.

crystal_ice

No error message! But it still won't output capital letters.

@
void MainWindow::on_textbox1_textEdited(const QString &arg1)
{
QRegExp reg("[A-Z]{1,50}");
QRegExpValidator val(reg,0);
ui->textbox1->setValidator(&val);
}
@

SGaist

You are setting the validator too late, do it in the constructor. Also, it will be destroyed at the end of on_textbox1_textEdited since it's allocated on the stack.

crystal_ice

Like this? It's still not working.

@
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
// setStyleSheet("background-image:url(':/step1/step2/step4.jpg');");
ui->setupUi(this);

QRegExp reg("[A-Z]{1,50}");
QRegExpValidator val(reg,0);
ui->textbox1->setValidator(&val);
ui->textbox2->setValidator(&val);
ui->textbox3->setValidator(&val);
    
ui->textbox1->setMaxLength(50);
ui->textbox3->setMaxLength(40);
ui->textbox4->setMaxLength(3);
ui->textbox4->setValidator(new QIntValidator(0,999, this));

}
@

SGaist

QRegExpValidor will still be destroyed at the end of the constructor.

Please have a look at it's usage in the documentation

Mortaneous

This is what I've been doing.
Using your example
@ void MainWindow::on_textbox1_textChanged(const QString &arg1)
{
// QFont.setCapitalization(QFont::AllUppercase);
ui->textbox1.setText(arg1.toUpper());
}
@

I was hoping there was a better way to do it. But it seems to me like there isn't.

Mortaneous

This is what I've been doing.
Using your example
@ void MainWindow::on_textbox1_textChanged(const QString &arg1)
{
// QFont.setCapitalization(QFont::AllUppercase);
ui->textbox1.setText(arg1.toUpper());
}
@

I was hoping there was a better way to do it. But it seems to me like there isn't.

SGaist

Hi and welcome to devnet,

Why not use QRegExpValidator ?

SGaist

Hi and welcome to devnet,

Why not use QRegExpValidator ?

Mortaneous

Thank you for the warm welcome.

I do use QRegExpValidator quite frequently, but I feel like this restriction reduces usability. From my experience, a validator will force exact input only, and reject anything else. Unless I'm not using it correctly.

What I usually need is a qtextbox or qlineedit that accepts all input, then transforms the input to be valid and acceptable (eg. uppercase) and reflects the changes immediately while the user is typing. Hence the @SLOT (textChanged(QString))@.

Is there a better way of doing this?

Mortaneous